Probing the Dark Side of Galaxy Formation: HST Imaging of the ISO ULTRADEEP Survey

Details Probing the Dark Side of Galaxy Formation: HST Imaging of the ISO ULTRADEEP Survey Probing the Dark Side of Galaxy Formation: HST Imaging of the ISO ULTRADEEP Survey

Jul 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999hst..prop.8331c&link_type=abstract

HST Proposal ID #8331

Computer Science

Hst Proposal Id #8331 Distant Galaxies

Scientific paper

The Hubble Deep Field {HDF} gave us an unprecedented view of the optical and rest-frame-UV side of galaxy formation. However, new data from ISO and COBE confirms the suspicion that the optical/UV does not tell the whole story. ISO observations have also demonstrated that this is true even in the HDF. These show the presence of 25 galaxies brighter than 200MuJy at 15Mum. However, it is so far unclear what distinguishes the ISO sources in the HDF from many similar HDF galaxies undetected by ISO. There is a suggestion that they are more often interacting systems, and that they have somewhat redder colours, but at this stage the sample size in the HDF is too small to draw definitive conclusions. We thus propose obtaining moderately deep { 24-25 mag arcsec^-2} imaging of the ISO ULTRADEEP survey region. This survey covers 25 arcmin^2 to a 75MuJy flux limit - larger and deeper than the ISOHDF - and includes 200 sources to the 3Sigma flux limit - nearly 10 times as many as found by ISO in the HDF. With o ur much larger sample we will examine the detailed morphologies, colours and colour-distributions and compare them with objects undetected by ISO. In this way we will determine what makes a galaxy mid-IR luminous, and thus uncover the origin of the strong evolution seen in this population. This will put us one step closer to understanding the dark side of galaxy formation.

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